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Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage.

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/*
 * Cobertura - http://cobertura.sourceforge.net/
 *
 * Copyright (C) 2006 Jiri Mares
 *
 * Cobertura is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Cobertura is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cobertura; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package net.sourceforge.cobertura.instrument;

import org.objectweb.asm.Label;
import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;


/**
 * Expects that the visitMaxs is calculated for me .... 
 */
public class NewLocalVariableMethodAdapter extends MethodAdapter implements Opcodes
{
	protected int firstStackVariable;
	protected int addedStackWords;

	public NewLocalVariableMethodAdapter(MethodVisitor mv, int access, String desc, int addedStackWords)
	{
		super(mv);
		Type[] args = Type.getArgumentTypes(desc);
		firstStackVariable = ((ACC_STATIC & access) != 0) ? 0 : 1;
		for (int i = 0; i < args.length; i++) {
			firstStackVariable += args[i].getSize();
		}
		this.addedStackWords = addedStackWords;
	}
	
	public void visitVarInsn(int opcode, int var) 
	{
		mv.visitVarInsn(opcode, (var >= firstStackVariable) ? var + addedStackWords : var);
	}

	public void visitIincInsn(int var, int increment) {
		mv.visitIincInsn((var >= firstStackVariable) ? var + addedStackWords : var, increment);
	}

	public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index)
	{
		mv.visitLocalVariable(name, desc, signature, start, end, (index >= firstStackVariable) ? index + addedStackWords : index);
	}

	public int getAddedStackWords()
	{
		return addedStackWords;
	}

	public int getFirstStackVariable()
	{
		return firstStackVariable;
	}

}